.studies on marine Oslrucods 61 



It is true that (A. H. FowLER in his work of 1909 counts from the older to the younger 

 stages, as I do, but he denotes the oldest mature stage, not the oldest larval stage, as Stage I. 

 As a result of this the oldest larval stage in the genus ConcJwecia is termed Stage III in this 

 work, as this writer assumes that this genus is characterized by two mature stages which dift'cr 

 from each other. It is to be noted that in several Ostracod groups moults — characterized by small 

 growth-factors and inconsiderable morphological alterations — occur after maturity is attained. 

 So far. however, we do not know which groups are characterized by post-larval moults; it is not 

 impossible that different species in the same genus differ from each other in this character. Nor do 

 we know how many larval moults the different species are characterized by. From these reasons 

 it may be evident that it is not convenient to follow the terminology used by G. H. FoWLER. 



